Actually i probably mean r== 0.5 && g==0.5 && b==0.5?1:0 Howard
On 24 Jul 2013, at 23:32, Howard Jones <mrhowardjo...@yahoo.com> wrote: > Something like > r==0.5 || r==0.32 || r==0.765?1:0 > Syntax maybe wrong and it might be && not || (and not or) but basically > saying if r= value or another value then make matte white else black > > > Howard > > On 24 Jul 2013, at 22:09, David Yu <dave...@gmail.com> wrote: > >> Thanks Frank! Will give it a shot. >> >> Is there a way so that I can isolate a pixel that has the same value in the >> R G and B Channel values. Eg. I have some "bad" pixels with values such as >> 0.5,0.5,0.5 0.765,0.765,0.765 0.32,0.32,0.32 etc.... >> >> Their neighbour pixels would always have different R G and B values. >> Usually lower because the bad pixels are always brighter than their >> neighbours. >> >> I'll try to post an image later. >> >> Dave >> >> >> >> >> On Wed, Jul 24, 2013 at 12:42 PM, Frank Rueter <fr...@beingfrank.info> wrote: >>> in that case just use something like >>> r>13, g>13, b>13 >>> >>> to check every channel against a threshold or to check the average instead: >>> (r+g+b)/3>13 >>> >>> etc. >>> >>> If you don't like the expression node you can also use Clamp, set the >>> minimum and maximum to whatever threshold and turn on minClampTo and >>> maxClampTo to map the clamped values to black and white. >>> >>> >>> >>> >>> >>> >>> On 24/07/13 16:36, David Yu wrote: >>>> Not NaNs. the hot pixel have RGB values do isnan does not work >>>> >>>> >>>> On Wed, Jul 24, 2013 at 5:28 AM, Frank Rueter <fr...@beingfrank.info> >>>> wrote: >>>>> and if it's NaNs or infs you need to isolate, you are after you can use >>>>> "isnan()" and "isinf()" in the Epxresison node to get a mask >>>>> >>>>> >>>>> On 24/07/13 09:04, Frank Rueter wrote: >>>>>> I'd use this technique to generate the mask for the bad pixels, but >>>>>> instead of blurring heavily, I would stencil out the original frame with >>>>>> the mask, then blur it just enough for a subsequent unpremult to fill >>>>>> the gap. >>>>>> >>>>>> >>>>>> On 24/07/13 05:47, John Mangia wrote: >>>>>>> Use an expression node with r > value ? 0 : 1 where value is the upper >>>>>>> threshold. Use that matte and keymix in a heavily blurred or >>>>>>> translated frame within the hot pixel matte. >>>>>>> >>>>>>> On Tue, Jul 23, 2013 at 1:43 PM, Ron Ganbar <ron...@gmail.com> wrote: >>>>>>>> Define hot. >>>>>>>> Do you mean NaNs and INFs? >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Ron Ganbar >>>>>>>> email: ron...@gmail.com >>>>>>>> tel: +44 (0)7968 007 309 [UK] >>>>>>>> +972 (0)54 255 9765 [Israel] >>>>>>>> url: http://ronganbar.wordpress.com/ >>>>>>>> >>>>>>>> >>>>>>>> On Tue, Jul 23, 2013 at 8:41 PM, David Yu <dave...@gmail.com> wrote: >>>>>>>>> Hi. Anyone know a script or expression to remove hot pixel noise from >>>>>>>>> images or 3d renders? >>>>>>>>> >>>>>>>>> I tried some crude 3x3 matrix tricks to enhance the pixels and tried >>>>>>>>> to "pull" the pixels out and subtract from the main image. Then i >>>>>>>>> used the result as a mask for a median filter set at 1. >>>>>>>>> >>>>>>>>> Looking at the RGB channels, the hot pixel is the same value on all >>>>>>>>> 3 channels while the neighbour pixels are different per channel. I'm >>>>>>>>> hoping for a more elegant way to detect hot pixel using an >>>>>>>>> expression. >>>>>>>>> >>>>>>>>> Dave >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> Nuke-users mailing list >>>>>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Nuke-users mailing list >>>>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> John Mangia >>>>>>> >>>>>>> 908.616.1796 >>>>>>> j...@johnmangia.com >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Nuke-users mailing list >>>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Nuke-users mailing list >>>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>>> >>>>> >>>>> _______________________________________________ >>>>> Nuke-users mailing list >>>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>> >>>> >>>> >>>> _______________________________________________ >>>> Nuke-users mailing list >>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> >>> >>> _______________________________________________ >>> Nuke-users mailing list >>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> _______________________________________________ >> Nuke-users mailing list >> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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